US Open Tennis Tournament: Serena Williams wins in straight sets yet again

In the US Open tennis tournament, Serena Williams won in straight sets again. She moved into an all-American showdown against Sloane Stephens. Other women moving into the third round included No. 2 Sofia Kenin, who won the Australian Open in February; No 7 Madison Keys, No. 15 Maria Sakkari, No. 18 Donna Vekic and No. 22 Amanda Anisimova, a teenager American who beat another fellow teen Kristina Scott.   Earlier men's winners included No. 2 Dominic Thiem, No. 11 Karen Khachanov, 2014 ch...